In the air, on the sea and on the land, engines for transportation have abruptly changed in the last 50 years since the WWII. For example, concerning the railway locomotive, it changed to the electric train from the steam locomotive in Japan. Also in many other countries, diesel engine locomotives and electric locomotives are expanding their use. The reasons were economy and environment.
During this time,the internal combustion engine technologies develops amazingly include lean bum in spark ignition engine, and high pressure fuel injection, multiple fuel injection and bulk combustion in diesel engine and others.
The candidates of new prime mover for the next century are being researched and proposed by several researchers. Although the ultimate zero emission fuel will be hydrogen, its production without any emission have been tried in Japan. All these activities for future prime movers proceeding with dreams of engineers.
